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  <title>创建一个数据库引用</title>

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</div><hr /><div id="mongocollection.createdbref" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">MongoCollection::createDBRef</h1>
  <p class="verinfo">(PECL mongo &gt;=0.9.0)</p><p class="refpurpose"><span class="refname">MongoCollection::createDBRef</span> &mdash; <span class="dc-title">创建一个数据库引用</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-mongocollection.createdbref-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type">array</span> <span class="methodname"><strong>MongoCollection::createDBRef</strong></span>
    ( <span class="methodparam"><span class="type">array</span> <code class="parameter">$a</code></span>
   )</div>

 </div>


 <div class="refsect1 parameters" id="refsect1-mongocollection.createdbref-parameters">
  <h3 class="title">参数</h3>    
  <p class="para">
   <dl>

    
     <dt>

      <em><code class="parameter">a</code></em>
     </dt>

     <dd>

      <p class="para">
       要创建引用的对象。
      </p>
     </dd>

       
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-mongocollection.createdbref-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   返回一个数据库的引用数组。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-mongocollection.createdbref-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-1407">
   <p><strong>Example #1 <span class="methodname"><strong>MongoCollection::createDBRef()</strong></span> 例子</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />$songs&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$db</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">songs</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$playlists&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$db</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">playlists</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">//&nbsp;为&nbsp;song&nbsp;创建引用<br /></span><span style="color: #0000BB">$manamana&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$songs</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">findOne</span><span style="color: #007700">(array(</span><span style="color: #DD0000">'title'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #DD0000">'Ma&nbsp;na&nbsp;ma&nbsp;na'</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">$refToSong&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$songs</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">createDBRef</span><span style="color: #007700">(</span><span style="color: #0000BB">$manamana</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;添加引用到我的播放列表<br /></span><span style="color: #0000BB">$playlists</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">update</span><span style="color: #007700">(array(</span><span style="color: #DD0000">'username'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #DD0000">'me'</span><span style="color: #007700">),&nbsp;array(</span><span style="color: #DD0000">'$push'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;array(</span><span style="color: #DD0000">'songlist'&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">$refToSong</span><span style="color: #007700">)));<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

  </div>
 </div>


 <div class="refsect1 seealso" id="refsect1-mongocollection.createdbref-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="methodname"><a href="mongocollection.getdbref.html" class="methodname" rel="rdfs-seeAlso">MongoCollection::getDBRef()</a> - Fetches the document pointed to by a database reference</span></li>
   </ul>
  </p>
 </div>


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